EP0885993B1 - Waschmaschine mit Auswuchtvorrichtung - Google Patents

Waschmaschine mit Auswuchtvorrichtung Download PDF

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Publication number
EP0885993B1
EP0885993B1 EP98107393A EP98107393A EP0885993B1 EP 0885993 B1 EP0885993 B1 EP 0885993B1 EP 98107393 A EP98107393 A EP 98107393A EP 98107393 A EP98107393 A EP 98107393A EP 0885993 B1 EP0885993 B1 EP 0885993B1
Authority
EP
European Patent Office
Prior art keywords
washing machine
manometric
stationary structure
type
washing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98107393A
Other languages
English (en)
French (fr)
Other versions
EP0885993A1 (de
Inventor
Giuseppe Frucco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi SpA
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Filing date
Publication date
Application filed by Electrolux Zanussi Elettrodomestici SpA, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0885993A1 publication Critical patent/EP0885993A1/de
Application granted granted Critical
Publication of EP0885993B1 publication Critical patent/EP0885993B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/16—Imbalance
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Imbalance; Noise level

Definitions

  • the present invention generally refers to washing machines, in particular, although not limited to, residential-type clothes washing and combined clothes washing and drying machines, that are provided with a suspended washing assembly including a rotating drum mounted inside an outer stationary structure.
  • washing machines usually those with a substantially horizontal-axis drum
  • the operating programmes of which comprise washing phases performed at drum rotating speeds comprised between 50 and 60 rpm, as well as spin-extraction phases performed at a considerably higher speed, which may reach up to 1800 to 2000 rpm.
  • An unbalance condition in the distribution of the washload items along the periphery of the rotating drum, especially during spin-extraction phases performed at such a high speed, may cause the washing assembly of the machines to undergo fluctuating or oscillatory displacements with respect to the outer stationary structure of the washing machine, said oscillatory displacements, further to giving rise to an undesired level of noise, being capable of even causing parts of the machine to suffer damages due to shocks and bumps.
  • a washing machine comprising means to detect the oscillatory displacements in excess of a predetermined amount and associated switching means that can be resetted only by the service personnel. Moreover there is no association between the said means and the pressureswitch means ensuring the level control of the washing liquor.
  • DE-U-69 16 091 discloses a protecting device for a washing machine which consists of a piezoelectric switch which switches off automatically the actuating motor of the rotational drum in case of a much too big unbalancing of the oscillating assembly.
  • a washing machine comprising means adapted to ensure a correct dynamic trim of the oscillating assembly and consisting of at least a transducer which is capable of converting the oscillatory displacements of the oscillating assembly with respect to the outer stationary structure of the machine into corresponding pressure variations and an associated pressure sensor so as to separately ensure also the level control of the washing liquor in the oscillating assembly.
  • the transducer consists of a riser which is not in contact with the outer stationary structure of the machine and contains at least one diaphragm loaded with a predetermined weight so as to have a natural frequency corresponding to a given rotating speed of the drum. While the use of a single pressure sensor actually simplifies the construction, an unbalance control of the oscillating assembly is only possible at the said given speed, i.e. not throughout the operation cycle of the machine.
  • a washing machine of the above indicated kind generally comprises a stationary parallelepiped-shaped outer structure comprising a base 1, a worktop 2, a front wall 3 with control panel 4 for the control and regulation members of the machine, among which a particular important role is played by the microprocessor-based programme sequence control device 5, and the drawer-like detergent dispenser (not shown).
  • the stationary structure of the washing machine further comprises a rear wall 6 and two side walls, of which only the right-hand one is shown in the Figure, as indicated generally at 7.
  • the front wall 3 of the stationary structure is provided with a circular aperture capable of being shut by a porthole-like door 9, which is used to load and unload the washload into and from the machine and is hinged on to the same front wall 3.
  • the stationary outer structure of the washing machine encloses an oscillating suspended assembly which comprises a substantially cylindrical wash tub 10 which is elastically connected to the outer stationary structure through upper suspension springs 11 and lower friction-type shock-absorber struts 12.
  • the oscillating assembly further comprises a drum 13 which is supported inside the tub 10 by its rear flange 14 by means of ball bearings (not shown) and a shaft 15 on which a pulley 16 is shrink-fitted. Said pulley, and therefore the drum 13, which is firmly secured to it, are driven through a drive belt 17 by the shaft 18 of an electric motor 19 attached to the lower portion of the tub 10.
  • a bellows-like gasket element 20 ensures a sealing connection between the above cited circular aperture 8 in the front wall 3 of the outer stationary structure and an associated aperture 21 provided in the front flange 22 of the tub 10, so as to enable the washload to be loaded into and unloaded from the drum 13 through the front aperture 23 thereof, which is arranged in a line with the afore cited apertures 8 and 21.
  • the water inlet circuit carrying the water from the supply mains into the oscillating assembly of the washing machine comprises a supply pipe and a detergent dispenser (not shown), whereas the washing liquor is discharged from the same assembly of the machine through an extensible pipe 24 coming out of the bottom of the tub 10, a drain pump 25 associated to a lint filter 26 that is accessible from the front wall 3 of the washing machine, and an outlet hose 27, of which only the initial portion is actually shown in Figure 1.
  • the washing machine comprises, associated to a pressure transducer 28, a differential manometric measurement and control device 30 which is preferably arranged in the uppermost portion of the machine, immediately below the worktop 2.
  • the pressure transducer 28 is adapted to convert the oscillatory displacements of the oscillating assembly with respect to the outer stationary structure of the machine into corresponding pressure variations.
  • the body of the transducer 28 is made in the shape of an elastically deformable bellows, with a vent hole (not shown), and its end portions are fixed to the rear wall 6 of the outer stationary structure and the rear flange 14 of the tub 10, respectively (see Figure 1).
  • the differential manometric device 30 which may be appropriately attached on to the side wall 5 by means of a metal bracket or similar means (not shown) in a position behind the control panel 4, essentially consists of two chambers 31 and 32, into which two small-diameter tubes 34 and 35, respectively, are leading.
  • the chambers 31 and 32 are separated from each other by an impermeable diaphragm 33 associated to a generator (not shown) of analogue electric signals.
  • a part of said manometric device 30 is finally an output 36 adapted to transmit the so generated electric signals to the microprocessor-based programme sequence control unit 5 of the washing machine through wires 38, as this will be explained in a more detailed manner further on.
  • the differential manometric device 30 may consist basically of a piezoresistive-type pressure switch, ie. a pressure switch that is adapted to generate voltage-modulated output signals, for instance of a type belonging to the series MPX2010 and MPX2012 (Case 352-02) supplied by Motorola.
  • the differential manometric device 30 may consist basically of an inductive-type pressure switch, ie. a pressure switch that is adapted to generate frequency-modulated output signals, for instance of a type similar to the Type 764 supplied by Elbi.
  • the first small tube 34 which, as this has already been said above, leads into the first chamber 31 of the differential manometric device 30, extends vertically over almost the whole length thereof and connects to the extensible pipe 24 for letting the washing liquor off the tub 10 through the bottom thereof. It therefore ensues that the pressure of the air in the small tube 34 and the chamber 31 varies with the level of the washing liquor inside the oscillating assembly of the washing machine, ie. with the static pressure on the bottom of the tub.
  • the second small tube 35 which leads into the second chamber 32 of the differential manometric device 30, comes from the transducer 28 and extends both horizontally and vertically.
  • the pressure of the air in the small tube 35 and the chamber 32 is exactly the dynamic pressure which, during the operation of the washing machine, gets established inside the transducer 28.
  • the value of such a dynamic pressure is mathematically correlated to the dynamic trim of the oscillating assembly of the washing machine and, more precisely, to the amplitude of the oscillatory displacements of said oscillating assembly with respect to the stationary structure of the washing machine.
  • the differential manometric device 30 will of course be so set and regulated as to ensure that an adequately wide variation range is available for both types of pressure involved, so that the respective signals are definitely clear and adequate under any possible operating and use condition of the washing machine.
  • the signals relating to the above cited pressures are sent by the output 36 of the differential manometric device 30 through the wires 38 to the programme sequence control unit 5 of the washing machine, where the detected values are compared on a continuously, throughout the operation cycle of the machine, with the reference values duly stored in the memory of the microprocessor, on a real-time basis. Should a need in this sense arise, ie. should any departure from pre-set limit conditions be so detected, corresponding modifications are introduced in the process parameters of the washing machine in the manner as substantially described in the afore cited Italian patent application no. PN97A000030 filed by the same Applicant.
  • the control of the dynamic trim of the oscillating assembly is performed directly and continuously, without any risk for the machine to suffer damages owing to an excessive extent of the oscillatory displacements of the oscillating assembly with respect to the stationary structure of the machine;
  • the particular component part required to implement the invention ie. the differential manometric device, is a well-proven, reliable and relatively low-cost one; and the space requirements of the same component part and the associated small tubes 34 and 35 are definitely modest and, therefore, fully compatible with any washing machine design for a simpler overall construction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)

Claims (4)

  1. Eine Waschmaschine, umfassend:
    einen äußeren feststehenden Aufbau, die eine Vorderwand (3) und eine Rückwand (6) beinhaltet;
    einen schwingenden Aufbau, der mit dem äußeren feststehenden Aufbau mittels eines elastischen Verbindungsmittels (11,12) verbunden ist und einen Kübel (10) und
    eine von einem Elektromotor (19) angetriebene und um eine im wesentlichen horizontale Achse (x) drehende Drehtrommel (13) umfaßt;
    eine vorzugsweise elektronische Einheit zur Steuerung der Programmabfolge (5); und ein Mittel, angepaßt um eine korrekte dynamische Feinabstimmung des schwingenden Aufbaus sicherzustellen, und welche aus wenigstens einem Wandler (28), welcher in der Lage ist, die Schwingungsverschiebungen des schwingenden Aufbaus bezüglich des äußeren feststehenden Aufbaus der Maschine in entsprechende Druckschwankungen umzuwandeln, und einer zugehörigen manometrischen Meß- und Steuereinrichtung (30) besteht, die ein Differenzdruckschalter ist, der angepaßt ist, um unabhängig, gleichzeitig auch die Pegelsteuerung der Waschflüssigkeit im Kübel (10) des schwingenden Aufbaus sicher zu stellen,
    dadurch gekennzeichnet, daß der Wandler (28) die Form eines elastisch verformbaren Balgs mit einem Luftloch hat, wobei dessen Enden in der Rückwand (6) des äußeren feststehenden Aufbaus beziehungsweise dem rückwärtigem Flansch (14) des Kübels (10) befestigt sind, und daß diese manometrische Meß- und Steuervorrichtung zwei Kammern (31,32) umfaßt, die voneinander durch eine undurchlässige Membran (33) getrennt sind, die zu einem elektrischen Signalgenerator gehört, wobei die erste der Kammern (31) durch eine erste Röhre mit kleinerem Durchmesser (34) mit dem Boden des Kübels verbunden ist, und die zweite der Kammern (32) durch eine zweite vorwiegend horizontale Röhre (35) mit dem Wandler (28) verbunden ist.
  2. Waschmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die manometrische Vorrichtung (30) im obersten Bereich des feststehenden Aufbaus der Maschine angeordnet ist.
  3. Waschmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die manometrische Vorrichtung (30) eine analoge Vorrichtung piezoresistiver Art ist, das heißt eine Vorrichtung, die angepaßt ist, um ihre spannungsmodulierten, durch Verbindungsdrähte (38) gesendeten Ausgabesignale (36) an die Einheit zur Steuerung der Programmabfolge auszugeben.
  4. Waschmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die manometrische Vorrichtung (30) eine analoge Vorrichtung induktiver Art ist, das heißt eine Vorrichtung, die angepaßt ist, um ihre frequenzmodulierten, durch Verbindungsdrähte (38) gesendeten Ausgabesignale (36) an die Einheit zur Steuerung der Programmabfolge auszugeben.
EP98107393A 1997-06-18 1998-04-23 Waschmaschine mit Auswuchtvorrichtung Expired - Lifetime EP0885993B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN970035 1997-06-18
IT97PN000035A IT1294135B1 (it) 1997-06-18 1997-06-18 Macchina lavatrice con controllo perfezionato dell'assetto dinamico del gruppo oscillante

Publications (2)

Publication Number Publication Date
EP0885993A1 EP0885993A1 (de) 1998-12-23
EP0885993B1 true EP0885993B1 (de) 2001-11-07

Family

ID=11395270

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107393A Expired - Lifetime EP0885993B1 (de) 1997-06-18 1998-04-23 Waschmaschine mit Auswuchtvorrichtung

Country Status (6)

Country Link
EP (1) EP0885993B1 (de)
JP (2) JPH119887A (de)
DE (1) DE69802338T2 (de)
ES (1) ES2166575T3 (de)
IT (1) IT1294135B1 (de)
PT (1) PT885993E (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19928383A1 (de) * 1998-06-27 1999-12-30 Miele & Cie Waschmaschine mit einem Niveausensor und mit einem System zur Messung von unwuchtbedingten Auslenkungen des Laugenbehälters
ATE259009T1 (de) * 1999-06-22 2004-02-15 Miele & Cie Waschmaschine mit einem system zur bestimmung der oberflächenspannung
ITPN20000017A1 (it) * 2000-03-27 2001-09-27 Zeltron Spa Lavatrice con trasduttore di spostamento del gruppo lavante
ES2226663T5 (es) * 2000-06-30 2008-02-16 Whirlpool Corporation Metodo para detectar y controlar el desequilibrio dinamico en un tambor de una maquina lavadora y maquina lavadora que utiliza dicho metodo.
CN100398735C (zh) * 2002-12-17 2008-07-02 乐金电子(天津)电器有限公司 滚筒洗衣机的波纹软管一体型气室结构
KR20050045260A (ko) * 2003-11-10 2005-05-17 삼성전자주식회사 수위감지장치가 구비된 드럼세탁기
JP4539350B2 (ja) * 2005-02-02 2010-09-08 パナソニック株式会社 洗濯機
DE102005028253B3 (de) * 2005-06-17 2006-11-02 Emz-Hanauer Gmbh & Co. Kgaa Vorrichtung und Verfahren zur Erfassung der Unwucht einer drehbaren Komponente eines Haushaltsgeräts und Haushaltsgerät damit
JP6074690B2 (ja) * 2011-02-23 2017-02-08 パナソニックＩｐマネジメント株式会社 ドラム式洗濯機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6916091U (de) * 1969-04-18 1969-11-27 Miele & Cie Unwuchtschutzvorrichtung
DE3027467A1 (de) * 1980-07-19 1982-03-04 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Trommelwaschmaschine
DE8905565U1 (de) * 1989-05-03 1989-08-31 Bsg-Schalttechnik Gmbh & Co Kg, 72336 Balingen Vorrichtung zur Füllmengenmessung und entsprechenden Dosierung bei Waschmaschinen
DE19549526C2 (de) * 1995-06-23 1999-02-11 Miele & Cie Verfahren zur Steuerung des Schleuderprozesses einer Waschmaschine
DE19616635B4 (de) * 1996-04-26 2007-09-27 AEG Hausgeräte GmbH Verfahren und Vorrichtung zur Unwuchterfassung einer Waschmaschine

Also Published As

Publication number Publication date
ITPN970035A1 (it) 1998-12-18
DE69802338D1 (de) 2001-12-13
IT1294135B1 (it) 1999-03-22
DE69802338T2 (de) 2002-06-27
JPH119887A (ja) 1999-01-19
PT885993E (pt) 2002-04-29
ITPN970035A0 (it) 1997-06-18
ES2166575T3 (es) 2002-04-16
EP0885993A1 (de) 1998-12-23
JPH1190086A (ja) 1999-04-06

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